Grease-gun.



,EL H. GULSON.

GREASE GUN.

APPLICATION FILED 001231, 1911.

Lfffw 3. Patented ont. 8, 1912.

'charge end 4IIVENRY HERBERT COLSON, 0F EVERETT, MASSACHUSETTS.

GREASE-GUN.

Specication of Letters Patent.

Patented oet. s, 1912.

Application tiled October 31, 1911.V Serial No. 657,822.

To all 'whom t may concern Be it known that I, HENRY HERBERT C01.-l

` soN, citizen of the United States, residing at Everett, .in the` county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Grease-Guns, of which the following. is a specification.' i

This invention relates to grease guns,v and has Yfor its object to provide a simplified structure of such guns', whereby the wear incident to compressing the grease to force the same out of the gun;is reduced to a minimum. At the same time the parts are so arranged that an operative may ascertain and knowat al glance approximately how much grease or lubricant remains in the gun after a certain amount of the lubricant has been discharged therefrom.

With this objectv in view the invention -consists in providing in combination with a gun consisting of a cylinder having a disand a piston slidably mounted therein, together with a handle.. attached to the piston and slidablymounted in that end of Vthe cylinder opposite its discharge end with'means for compressing air andv forcing the same into the cylinder between one .end thereof and the piston, whereby the piston is moved against the'grea'se and the grease is forced out of the gun. t

A further object of the inventionis to provide a' structure in 'which the parts are compactly and substantially assembled and with this object in view the cylinder isprovided at itsfends with castings of peculiar' design which support the air pump and its attachments so that when the air pump is operated there will be no side strain calculated to force orspring the air pump out of its proper position with relation'to the ycyl,-v inder.

For a full understanding of. the inventionl reference. is to be had to the lfollowing del' vscription and accompanying drawings, in

which: l v

Figure 1 is a view of the elevation, partly in section of the improved grease cup. Fig.

2 is a vertical section view taken on the line 2'-2 of Fig. 1. Fig. 3 is a transverse section f view taken lon the line 3-3 of Fig. 1.

Corresponding and like. parts are re'- ferred to' in the following description and yindicated, in all the 4views of' the accompa- Athe said piston is forced down u pon nying drawings by the same reference' characters.

, .The grease gun includes a cylinder 1 upon the lower end of 'which is mounted a band 2. A head 3 is 4screw'threaded upon the band 2 andcloses' one end `of the cylinder 1. The head 3 is designed to be,l

vconnected with an oil pipe 4 in any "approl priate manner. A head 5 is screw threaded upon the opposite end of the'lcylind'er 1" which is closed by the head 3. A stem 6 passes through the head 5 and is attached at its inner endto the piston 7'which is of any approved patteru and which is slidably mounted in the cylinder 1. The band 2 is` provided at one sido with a nipple S and the head 5 is provided at. the same side with a nipple 9. The nipple 9 communicates with the interior of the chamberz 1 through the side of the head 5 and a valve 10 is mounted upon the said nipple 9. A'pipe 11 connects the nipples 8 and 9 together'. A plug 12 is del ,tachably mounted in-.the nipple 8 and retains a ball 13 therein which is adapted to serve as a check valve. Any other 'form of` check valve may be employed if desired. The valve 13 is adapted to operate over the inner end of a by-pass 14 with which the nipple 8 is provided.y :1 cylinder 15 communicates at its lower end with the by-pass. 14 and at its upper end is supported bythe head 5. A piston 16 is slidably mounted in the cylinder 15 and is provided at the upper end of its stem with a handle 17.

In operation, the head B is unscrewed 'from the pipe 4, whereby the grease gun. is detached from the 'said pipe. The head 3 is then unscrewed from the band 2 and the piston 7 is moved down to the lower end of the cylinder .1 which isthen in -an inverted screwed into engagement with the pipe V4,

when the cylinder 1' is in its proper position.

. Then by reciprocating the piston 16l by the use'of the -handle 17 air is forced down through the cylinder 15,' through the bypass 14 and the ,valve 13 into .the nipple 8.

Through the nipple 8 the air passes tothe pipe 11 and into the nipple 9and from thenipple 9 into the upperend of thevcylinder 1 above the ypiston 7 locatedtherein. Thusthe oil 51am. operative maydeterinine at a glz'ince` omgrease. and thevinturn is' forcedown 'th-rough thehead --gand the pipe 4 to of a machine towhich it is to -be ledAgs soon .as tl:l'e operation .of the air pumpand. piston 16 located therein is inten.

rupted, the valve .13` is 'forced back against theend of the by-pass 14 by the'backpressure and the 'contentsJ of the cylinderl are maintained underpressure. 1 l

y The stein 6 may be provided withgraduatifonssothat as it descends 4through the head teamount of grease or lubricant thatvhas been consumed 'or used.

This' grease #un is especially adaptedto livey used upon' automobiles' or similar ve- 3oto the. discharge, and `a valved'cqnitritfcommuncating at its inner end-with the interior lof the cylinder. at said lside of hieles where `space islmited and where it desirable to havethe parts compactly and at Vthe same time substantiallyv4 assembled.

Having thus described the invention, what is claimedas new 1,.'In a-'grease"gun, the combination o fa eylmderlhavi'ng-a discharge, a 'reciprocatory piston disposed in the cylinder and -liavingastem extending outsidezthe cylinder whereby the piston may be drawn by hand ina direction away from the discharge, meansor introducing fluid under pressure iiyrdsotliecylinder' at the lopposite side ofthe the piston and communicating at its' outer A with the atmosphere, whereby when the valve 'of the conduit is open the 'piston can be easily drawn in a direction away from the discharge.'l

2. A lgrease gunvcom'prising a cylinder, a hea/d closing one end thereof and having a nipple' and also having a valved conduit communicating at its inner end with the interior of the cylinder'and at its outer end with the atmosphere, aband located at the opposite end of the cylinder and having a nipple provided with a by-p'ass, a head de- .v tachably secured on said band 'and having a discharge and adapted to be detachably connected to an oil pipe, a reciprocatory piston disposed in said'cylinder and having a stem extending in a' direction away from said discharge and outside the'cylinder, a pipe connecting the nipples together and communicatingatvits upper end with the interior of the cylinder, a cylinder fixed to the band and to the head at the opposite end offthe firstnamed cylinder, a passage between the lower f ends of the second-named cylinder and the pipe, a non-return valve in saidpassage, and a reciprocatory piston in the secondnamed cylinder andhaving 'a stem 'extending outside the same.

In .testimony whereofl aiiix my signature in the presence o f two witnesses'.

'HENRY HERBERT COLSON Witnesses y Y Ronin L; Mironsnmy f MARY E. BOWDEN. 

